Postfix: why is 'Return-Path' of bounce message empty?
I found that in my postfix, the bounced mails that return to senders have 'Return-Path: <>', if the mails come from internet, this make the failures of "returning to sender", because:
"You are not authorized to send mail as <>"
"invalid user - <> SIZE=2509"
I'm not clear about the meaning of 'Return-Path', is there anyone can give me an explanation?
I explored the mailbox, and found:
Some mails were bounced by the remote server, and I found that the 'Return-Path' of the message which my server sent is right(USER@SITE.com). Why?
I believe I've read that returned mail has a source address of <> (the null address) on purpose, to prevent mail delivery loops.
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